Composition containing 1,1-dichloro-1-fluoroethane, 1,1,1,3,3-pentafluorobutane and methanol for the cleaning or drying of solid surfaces
CA 2067266 C · Owner: Michaud, Pascal · Inventors: Michaud, Pascal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a compound consisting of 60% to 90% by weight of 1,1-dichloro-1-fluoroethane (F141b) 9% to 33% of 1,1,1,3,3 pentafluorobutane (F365 mfc) and 1% to 7% of methanol. These three compounds form a positive azeotrope (Boiling point=29.1 degrees C at normal pressure). The compound once stabilized, can be used for cleaning and/or drying solid surfaces in particular for defluxing printed circuits and degreasing mechanical parts. These uses are also aims of the invention.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 27, 1992 and granted December 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.